Search the Community
Showing results for tags 'american standard'.
greetings all-been a few months since I've visited hope all is well with everyone. question: do any charts exist telling of American screw thread sizes for vintage pocket watches? I seem to be having a tough time finding anything other than the fact that back then prior to the 1955 "thread summit" I'll call it, where the European and American powers-that-be agreed on a universal standard thread pitch across the board(UNM miniature), that European was metric and American was their standard inch pitches, with the exception of Elgin and Waltham, who made their own specific(adding to my frustratin